Coaxial cable for inductive charging

Abstract

The present invention relates to a coaxial cable. One embodiment of the coaxial cable comprises: a non-conductive cable core. The coaxial cable comprises: a first flexible copper conductor, which surrounds the non-conductive cable core and serves as an inner conductor of the coaxial cable. The coaxial cable comprises: an insulator surrounding the first flexible copper conductor. The coaxial cable comprises: a second flexible copper conductor, which surrounds the insulator and serves as an outer conductor of the coaxial cable.

Description

Technical Field

[0001] The invention relates to a coaxial cable, in particular to a coaxial cable used for charging an electric vehicle. Background Art

[0002] Conductors and cables are used for various applications. In particular, such applications may be fields of use in which large currents and / or high frequencies (e.g. high frequency ranges) are used. For example, the cables are used for charging vehicles, such as for inductive charging of vehicles. One possible way of inductively charging a vehicle provides that a charging station is connected to a charging device via a cable / charging cord. The charging device may be arranged on the ground and include an inductor. The charging station is then not connected directly to the vehicle during the charging process, but is connected to the charging device via a cable. The vehicle can then be placed / moved onto the charging device for inductive charging in a known manner.

[0003] Large currents in the range of several amperes and above require a suitably large conductor cross section. During the transmission of an alternating signal (e.g., alternating current), the current in the conductor cross section is moved to the conductor surface by the internal magnetic field as the frequency increases. This effect is called the skin effect. For example, at a frequency of 10 MHz, the current density 20 μm below the surface is only 1 / e (37%) of the current density at the outermost surface. This means that only a small portion of the total cross section of the cable carries the majority of the current.

[0004] As is known, in many areas of electrical engineering, cables with litz wires are used. In electrical engineering, a litz wire is an electrical conductor consisting of thin individual wires. Litz wires are usually easy to bend. In cables, copper is usually used as the conductor. The individual wires of the litz wire (for example, several hundred individual wires) are in most cases enclosed in a common insulating sleeve. Conductors formed in this way are usually called litz wires or litz wire conductors. If several such wires are combined into a cable, they are usually called cable leads (Ader).

[0005] In order to reduce the skin effect and / or the so-called proximity effect, which results from the displacement of current between two closely adjacent conductors, an insulator is usually provided between the individual conductors of a high-frequency litz wire, often abbreviated to HF litz wire. Enameled wire is usually used for insulation, i.e. the individual conductors of the litz wire are insulated from one another by a layer of enameled wire. This insulation is also provided accordingly when the litz wires have the same potential. By reducing the skin effect and / or the proximity effect, a larger part of the total cross-section of the cable is involved in the transmission current. However, this process is complicated in terms of the production and processing of the cable. In addition, a cable with a complex structure is formed.

[0006] That is, for high-frequency applications, enameled single wires are traditionally used, which form Litz wire cables. Due to the high frequency, the electrons are pushed to the outside of the conductor during the current transmission. If a conductor exceeding a certain diameter is used, then at higher frequencies, no current or only a negligibly small current flows in the core of the conductor. The frequency determines how far the electrons are pushed to the outside. This so-called penetration depth is crucial for the wire or conductor diameter to be used. Insulating the thin single wires from each other increases the power transmission over a relatively small cross-section. Such thin, insulated single wires are usually called enameled conductors.

[0007] Litz wire cables known from the prior art are complex in construction, expensive to produce and generally have a relatively high power dissipation.

[0008] Therefore, it is necessary to provide a cable with a simple structure and good electrical performance, especially good high-frequency performance and / or as low power dissipation as possible. Summary of the invention

[0009] According to a first aspect of the present invention, a coaxial cable is provided. The coaxial cable comprises a non-conductive cable core. The coaxial cable comprises a first flexible copper conductor surrounding the non-conductive cable core and serving as an inner conductor of the coaxial cable. The coaxial cable comprises an insulator surrounding the first flexible copper conductor. The coaxial cable comprises a second flexible copper conductor surrounding the insulator and serving as an outer conductor of the coaxial cable.

[0010] The coaxial cable may also be referred to as a coaxial cable or a coaxial conductor. The configuration of the coaxial cable results in a relatively uniform field line distribution. This results in, in particular, reduced power dissipation during power transmission using the coaxial cable compared to conventional Litz wire conductors. In the example case where the coaxial cable is used in or as an inductive charging cable, the uniform field line distribution results in reduced power dissipation during power transmission using the coaxial cable compared to conventional Litz wire conductors. Due to the very low resistivity of copper, approximately 0.017 ohm*mm 2 / m, so the conductivity of the coaxial cable is very high.

[0011] Due to the skin effect, the charge carriers of the current will in any case move to the outer area of ​​the conductor as far as possible at high frequencies, and thus to the area which corresponds at least to the greatest extent to the flexible copper conductor of the coaxial cable. The non-conductive cable core consists of a non-conductive material or includes a non-conductive material. The non-conductive cable core (which can also be called a cable core) itself has at least almost no conductivity. Therefore, the cable core at least hardly participates in the conduction of the current. In addition, the cable core is relatively stable and loadable mechanically, and is at least more stable mechanically than the flexible copper conductor surrounding the cable core. In the coaxial cable proposed here, the cable core does not participate in the conduction simply because the cable core consists of a non-conductive material, and therefore has at least almost no influence on the current transmission / power transmission.

[0012] The non-conductive cable core, the first flexible copper conductor and the second flexible copper conductor are in particular arranged coaxially around a common center point.

[0013] Today's coaxial cables for high currents and high voltages are in the form of copper tubes / small copper tubes or include copper tubes / small copper tubes as conductors. Copper tubes / small copper tubes are not flexible / not (easy to) bend. This results in the cable being inflexible. However, in various types of applications (e.g., inductive charging), such as flexible cables are needed because the cables must be laid under roads, for example, in places where there is a lack of space. The flexible copper conductor of the coaxial cable according to the first aspect results in a coaxial cable that is more flexible than known coaxial cables. The term flexible conductor will be understood by those skilled in the art. In a further sense, flexibility can be understood in this article as non-rigid, or not hard, or bendable. In a narrow sense, flexible copper conductors can be understood as being more flexible / more bendable / lower rigidity / less hard than known copper tubes / small copper tubes.

[0014] The insulator between the first and the second flexible copper conductors may have a thickness of, for example, 0.1 to 4 mm (seen in the radial direction of the coaxial cable), for example, at least or exactly 2 mm. The insulator may also be referred to as a dielectric. The dielectric may be in the form of a solid dielectric. During manufacturing, the dielectric is usually foamed, but may also be wound. The dielectric is arranged between the inner conductor and the outer conductor. The first and the second copper conductors are spaced apart from each other by the dielectric.

[0015] For example, the first flexible copper conductor surrounding the non-conductive cable core directly acts on the non-conductive cable core and is in contact with it. Alternatively, the first flexible copper conductor surrounding the non-conductive cable core does not directly (but indirectly) act on the non-conductive cable core and is not directly but only indirectly in contact with it. For example, an insulating layer may be arranged between the non-conductive cable core and the first flexible copper conductor.

[0016] The coaxial cable also includes a shielding member arranged around the second flexible copper conductor. The shielding member can at least reduce or even avoid the interference of the electric field of the coaxial cable on other electronic components. The shielding member can also be called a shield or an electric shield. By adjusting the distance between the outer conductor and the shielding member, the induction of the electric field of the coaxial cable on the power dissipation of the shielding member can be adjusted.

[0017] It is conceivable that the shielding member may be a simple braid, a film, or a combination of a braid and a film. The shielding member may also be in the form of a flat braid.

[0018] The outer conductor may have shielding properties and thus be in the form of a shield. In other words, the outer conductor and the shield may be one and the same element, which provides the function of the outer conductor on the one hand and the function of the shield on the other hand. That is, the outer conductor may be the shield. Alternatively, the outer conductor and the shield may be different, separate components. For example, the shield may be arranged around the outer conductor. In this case, the outer conductor may be arranged between the shield and the dielectric.

[0019] The non-conductive cable core may for example comprise or be formed of a plastic material. Additionally, the non-conductive cable core may comprise or be formed of air. For the non-conductive cable core, a combination of plastic material and air is conceivable.

[0020] The non-conductive cable core may comprise a heat absorbing insulating material. For example, the heat absorbing insulating material may already be / be introduced into the non-conductive cable core. The heat absorbing insulating material may be a plastic material. For example, the non-conductive cable core is partially or completely formed by the heat absorbing insulating material. The non-conductive cable core body may, for example, consist entirely of the heat absorbing insulating material.

[0021] If the non-conductive cable core comprises a heat absorbing / insulating material, or the non-conductive cable core even consists of a heat absorbing material (and accordingly takes the form of a non-conductive, heat absorbing cable core), very high heat dissipations occurring in high-frequency conductors can be accommodated.

[0022] The insulating material used in or for the non-conductive cable core may include cross-linked polyethylene (PE-X) or consist of PE-X. In this case, the non-conductive cable core may have a relative permittivity (also commonly referred to as relative dielectric constant) of about 2.25, a comparative tracking index (Kriechstromfestigkeit) (CTI) of KA:3b; KB>600; KC>600 according to IEC 60112, and / or a thermal conductivity in the range of 0.32 to 0.40 W / (m*K).

[0023] The filler used in or for the non-conductive cable core may include, for example, polypropylene (PP) or consist of PP. In this case, the non-conductive cable core may have a relative permittivity (also commonly referred to as relative dielectric constant) of about 2.27, 1x10 3 Dissipation factor, KA:3b according to IEC 60112; KB>600; Comparative Tracking Index of KC>600, and / or thermal conductivity in the range of 0.17 to 0.22 W / (m*K).

[0024] For example, a coaxial cable has as low a capacitance as possible between the layers. For example, in particular between two flexible copper conductors. This can be achieved, for example, by using foam between the copper conductors or the layers of the coaxial cable. As a result, the capacitance value of the coaxial cable is very low.

[0025] The first flexible copper conductor may be in a layered form. The cross section of the first flexible copper conductor may be annular. Additionally or alternatively, the second flexible copper conductor may be in a layered form. The cross section of the second flexible copper conductor may be annular.

[0026] The first flexible copper conductor may include, or may be formed of, a plurality of copper single wires (single copper wires) that are not insulated from each other. Additionally or alternatively, the second flexible copper conductor may include, or may be formed of, a plurality of copper single wires (single copper wires) that are not insulated from each other. In each case, the single wire may have a thickness in the range of 0.05 mm to 0.5 mm, for example, at least or exactly 0.1 mm thick.

[0027] The plurality of individual copper wires in the first and / or second flexible copper conductor that are not insulated from each other improves the flexibility of the copper conductor and, compared with the enameled wire or copper tube / small copper tube used in the prior art, thus improves the flexibility of the coaxial cable as a whole. The individual copper wires can be round or flat. Combinations of round and flat individual copper wires are also conceivable. For example, all individual copper wires can be in the form of flat conductors or round conductors.

[0028] The first flexible copper conductor may include one or more copper braids, or be formed of one or more copper braids. Additionally or alternatively, the second flexible copper conductor may include one or more copper braids, or be formed of one or more copper braids. For example, the one or more copper braids of the first flexible copper conductor may be formed of a plurality of individual copper wires that are not insulated from each other. Additionally or alternatively, the one or more copper braids of the second flexible copper conductor may be formed of a plurality of individual copper wires that are not insulated from each other.

[0029] The first flexible copper conductor may include one or more wire bundles, or be formed by one or more wire bundles. Additionally or alternatively, the second flexible copper conductor may include one or more wire bundles, or be formed by one or more wire bundles. For example, the one or more wire bundles of the first flexible copper conductor may be formed by a plurality of single copper wires that are not insulated from each other. Additionally or alternatively, the one or more wire bundles of the second flexible copper conductor may be formed by a plurality of single copper wires that are not insulated from each other.

[0030] Regardless of the precise configuration of the copper conductors, the first copper conductor and the second copper conductor are flexible (bendable). The flexibility of the first and second copper conductors can be achieved, for example, by twisting or braiding a plurality of individual copper wires. Depending on the lay length of the twist or braid, different degrees of flexibility can be achieved. The shorter the lay length used, the more flexible the copper conductors, and thus the coaxial cable, is (twist / lay angles, for example, between 40°-75°).

[0031] The insulator and optional further insulator of the coaxial cable may comprise or consist of a thermoplastic insulating plastic material. Alternatively, the insulator and optional further insulator of the coaxial cable may comprise or consist of cross-linked polyethylene (PE-X). If the insulator is formed of PE-X, it has a relative permittivity (also commonly referred to as relative dielectric constant) of about 2.25. If the insulating material is formed of PE-X, it has the following comparative tracking index (CTI) according to IEC 60112: KA: 3b; KB>600; KC>600. If the insulating material is formed of PE-X, it has a thermal conductivity in the range of 0.32 to 0.40 W / (m*K).

[0032] The fillers used in coaxial cables may include, for example, polypropylene (PP) or be formed of PP. If the fillers are formed of PP, they have a relative permittivity (also commonly referred to as relative dielectric constant) of about 2.27 and a relative dielectric constant of 1x10 3 The dissipation factor of the insulation and fillers used allow use up to 90°C (and 20,000 hours). If the fillers are formed of PP, they have the following comparative tracking indices according to IEC 60112: KA: 3b; KB>600; KC>600. If the fillers are formed of PP, they have a thermal conductivity ranging between 0.17 and 0.22 W / (m*K).

[0033] The coaxial cable may further include at least one sensor. At least the at least one sensor may be configured as a temperature sensor for detecting the temperature of the coaxial cable.

[0034] The coaxial cable may further comprise at least one second sensor. The at least one second sensor may be configured to monitor a status of the cable and communicate the status to a user via an evaluation unit.

[0035] The temperature sensor may be configured as a sensor wire introduced into a coaxial cable, for example, as a sensor wire braided into the coaxial cable.

[0036] In an exemplary embodiment, the coaxial cable may include at least two sensors. At least one of the at least two sensors may be configured as a temperature sensor. The temperature sensor is configured to detect the temperature of the coaxial cable. The temperature sensor may be configured as a sensor wire introduced into the coaxial cable. For example, the temperature sensor may be interwoven or woven into the coaxial cable in the form of a sensor wire. By means of the temperature sensor, it is possible to determine and selectively monitor in a simple manner whether the coaxial cable is in an appropriate temperature range. For example, the coaxial cable may be monitored for overheating by means of a temperature sensor. The introduced sensor wire may be / has been flexibly woven into the cable so that the cable is not damaged thereby.

[0037] The temperature sensor and / or the at least one second sensor may be in the form of a resistance-based segment sensor. The at least one second sensor may be a sensor for measuring at least one other parameter in addition to temperature. For example, the coaxial cable may include or be configured as a sensor cable (at least one conductor) for measuring temperature or at least one other parameter.

[0038] The segment sensor can be configured as a sensor wire. The sensor wire can be configured to detect an environmental variable, such as temperature, and comprises a core and some resistor elements, which are spaced apart from each other in the longitudinal direction and have corresponding resistance values. The change in the resistance value depends on the value of the environmental variable (such as temperature). In the present case, the core is used, for example, to relieve tension for the mechanical stability of the sensor wire. To this end, the core particularly comprises a plastic material, such as aramid or polyethylene (PE). Alternatively, the core is configured as one or more electrical or optical transmission elements. The sensor wire extends from a first end to a second end. The corresponding resistor elements thus define a measurement segment along the sensor wire. For example, the resistor elements are arranged at a predetermined distance from each other along the sensor wire. In other words: the measurement segment defines a selected segment along the sensor wire, in which an environmental variable, such as temperature, - in particular a change in the environmental variable, such as a change in temperature, - can be detected in a segment-dependent manner, so that based on the measurement segment in which a change in the environmental variable (especially temperature) is detected during operation, it can be inferred at which position / location along the sensor wire the change in the environmental variable occurs.

[0039] The coaxial cable, in particular at least two sensors, can be connected to an evaluation unit. The evaluation unit can be, for example, an external evaluation unit. The evaluation unit can be connected to the coaxial cable, for example, via a cloud or configured as a cloud. The evaluation unit can be configured to evaluate data obtained from the coaxial cable. The evaluation unit can be configured to warn and optionally respond to possible faults based on the evaluated data. According to the second aspect of the invention, the coaxial cable can form a common system with the evaluation unit. In other words, the system according to the second aspect of the invention can include a coaxial cable and an evaluation unit.

[0040] With a coaxial cable, in a fixed installation state, a bending radius (more specifically, an inner bending radius) of, for example, 2xD or 4xD can be achieved. In a freely movable state, a bending radius of 2.5xD or 6xD can be achieved. "D" is the outer diameter of the coaxial cable, i.e. "2xD" means that the bending radius is twice the outer diameter of the coaxial cable. The bending radius here means, for example, the radius to which the coaxial cable can be bent without being damaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The present invention will be further explained with reference to the accompanying drawings. The accompanying drawings schematically show:

[0042] Figure 1 An exemplary embodiment of a coaxial cable. DETAILED DESCRIPTION

[0043] Specific details will be listed below, but not limited thereto, to provide a complete understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention may be applied to other exemplary embodiments that may differ from the details listed below. In addition, the drawings are only used to illustrate exemplary embodiments. They are not drawn to scale, but only reflect the general concept of the present invention by way of example. For example, the features included in the drawings should never be considered as essential components.

[0044] Figure 1 An exemplary embodiment of a coaxial cable 10 is shown. The coaxial cable includes a non-conductive core 12. The coaxial cable 10 also includes a first flexible copper conductor 14 surrounding the non-conductive core 12. The first flexible copper conductor 14 serves as an inner conductor of the coaxial cable 10. The coaxial cable 10 also includes an insulator 24 surrounding the first flexible copper conductor 14. The coaxial cable 10 also includes a second flexible copper conductor 18 surrounding the insulator 24. The second flexible copper conductor 18 serves as an outer conductor of the coaxial cable 10.

[0045] The coaxial cable 10 optionally further includes a shield 20 disposed around the second flexible copper conductor. The shield 20 may also be referred to as a shield body 20. The coaxial cable 10 optionally further includes an insulator 22 surrounding the non-conductive core 12. The coaxial cable 10 optionally further includes an insulator 26 surrounding the second flexible copper conductor 18.

[0046] In summary, Figure 1 A schematic diagram of a coaxial cable 10 is shown, the coaxial cable 10 having a non-conductive core 12, a first flexible copper conductor 14 as an inner conductor, a second flexible copper conductor 18 as an outer conductor, an optional shield 20, an optional insulator 22 between the non-conductive core 12 and the first flexible copper conductor 14, an insulator 24 between the first flexible copper conductor 14 and the second flexible copper conductor 18, and an optional insulator 26 between the second flexible copper conductor 18 and the shield 20.

[0047] The first flexible copper conductor 14 may include Figure 1 A plurality of individual wires, litz wire conductors or braids not shown in the drawings, or may be made of Figure 1 The second flexible copper conductor 18 may include a plurality of individual wires, Litz wire conductors or braids not shown. Figure 1 A plurality of individual wires, litz wire conductors or braids not shown in the drawings or by Figure 1 The wire arrangement is formed by multiple individual wires, Litz wire conductors or braids not shown.

[0048] By way of example only and not limitation, the outer diameter of the first flexible copper conductor 14 (inner conductor) is approximately 5.7 mm, the inner diameter of the second flexible copper conductor 18 (outer conductor) is approximately 10.2 mm, the inner diameter of the shield 20 is approximately 15.2 mm, and the outer diameter of the coaxial cable 10 is approximately 19.4 mm. These values ​​should be understood as being purely exemplary and are only used to illustrate possible configurations of the coaxial cable 10. Other values ​​are possible. Further tolerances must be taken into account when producing the coaxial cable 10 and its various components.

[0049] By means of the coaxial cable 10, efficient current transmission can be achieved. As previously mentioned, the charge carriers (electrons) for transmitting current are pushed outward more or less depending on the frequency at high frequencies, which is referred to as the penetration depth. Therefore, even with a corresponding penetration depth, the first flexible copper conductor 14 is arranged on a non-conductive material, referred to herein as a non-conductive cable core 12, and efficient current transmission still continues. The non-conductive cable core 12 can be, for example, a plastic cable core. Alternatively, the non-conductive cable core 12 can also be air. The first flexible copper conductor 14 and / or the second flexible copper conductor 18 can be annular or their cross-section can be annular.

[0050] In order to allow the coaxial cable 10 to remain flexible during use, the first flexible copper conductor 14 and / or the second flexible copper conductor 18 can be composed of flexible wire layers. The flexible wire layer can be one or more Litz wires / Litz conductors. The Litz wire / Litz conductor can have a relatively small diameter, for example, to allow the desired flexibility. The flexible wire layer can also be one or more copper braids. A copper braid or multiple copper braids can each be woven from multiple copper conductors / single copper wires, or include multiple single copper wires woven together. The multiple single copper wires woven together are particularly not insulated from each other / relative to each other, that is, the single copper wires are not single wires insulated with enameled wires. In other words, the flexible copper conductors 14, 18 can be configured as bundles or braids.

[0051] The inner conductor (first flexible copper conductor 14) can be, for example, a forward conductor (Hinleiter) of the coaxial cable 10. The outer conductor (second flexible copper conductor 18) can be, for example, a rearward conductor (Rückleiter) of the coaxial cable 10. Alternatively, it is conceivable that the inner conductor (first flexible copper conductor 14) is, for example, a rearward conductor of the coaxial cable 10 and the outer conductor (second flexible copper conductor 18) is a forward conductor of the coaxial cable 10. Regardless of the precise configuration, the forward conductor and the rearward conductor are preferably able to carry corresponding currents of the desired current intensity. The conductor cross sections of the inner conductor, the outer conductor and / or the entire coaxial cable can be selected, designed or adjusted accordingly.

[0052] There is a voltage of up to 1000 V between the inner conductor and the outer conductor. This generates an electric field. If the thickness of the insulating wall, that is, the thickness of the insulator 24 between the inner conductor and the outer conductor, is too small in the radial direction of the coaxial cable 10, or if the insulator 24 is too conductive, then the leakage current These leakage currents can cause short circuits and damage the insulator 24 over time. Therefore, it is necessary to prevent these leakage currents from occurring.

[0053] In order to at least reduce (if not completely avoid) the interference of the electric field with other electronic components, a shield 20 is provided around the flexible copper conductors 14, 18. However, the electric field will also cause power dissipation in the shield 20. This depends on the distance between the outer conductor 18 and the shield 20.

[0054] Figure 1 Sensors not shown in the figure can further be integrated into the coaxial cable 10. Heat-absorbing insulating materials can be introduced into the non-conductive cable core 12. Foams are also conceivable.

[0055] Figure 1The coaxial cable 10 schematically shown in FIG. 1 can be used as a charging cable for an inductive charging application. For this application, the coaxial cable 10 is configured to allow a transmission power of about 11 kW. In the case of this application, the coaxial cable 10 is further configured to be able to transmit current at a frequency of 85 kHz. In this application, the coaxial cable 10 is configured to allow a voltage of 1000 V to be applied. This results in a current intensity of 30 to 50 A being conducted by the coaxial cable 10.

[0056] The coaxial structure of the coaxial cable 10 has advantages over the prior art, in which insulated individual conductors, such as enameled wires, are combined into bundles, litz wires or cables. On the one hand, the coaxial cable 10 allows a uniform field line distribution. During power transmission, for example in a connecting line for inductive charging, the uniform field line distribution leads to a particularly reduced power dissipation. Due to the lower power dissipation in the coaxial cable 10, this leads to a particularly reduced heating of the coaxial cable 10.

[0057] The coaxial cable 10 is a compact cable and therefore has advantages in terms of over-limit safety. In addition, a sensor for detecting temperature, such as a sensor wire, can be easily introduced into the coaxial cable 10. When a non-conductive cable core 12 composed of or including a heat absorbing material such as a heat absorbing plastic material or a heat absorbing foam is used, latent heat is additionally stored.

[0058] In addition to its application in inductive charging, the coaxial cable 10 may also be used in situations where high frequencies are a concern in transmission and skin effects must be considered in the cable design configuration.

[0059] The coaxial cable 10 provides an improved cable for various high frequency applications, such as inductive charging of electric vehicles.

Claims

1. A coaxial cable, comprising: - non-conductive cable core; - a first flexible copper conductor surrounding the non-conductive core and serving as an inner conductor of the coaxial cable; - an insulator surrounding said first flexible copper conductor; as well as - a second flexible copper conductor surrounding the insulator and serving as the outer conductor of the coaxial cable, wherein the non-conductive cable core comprises a plastic material as a heat-absorbing insulating material and air, The insulating material used in or for the non-conductive cable core comprises cross-linked polyethylene (PE-X) or consists of cross-linked polyethylene, and the non-conductive cable core has a thermal conductivity ranging between 0.32 and 0.40 W / (m*K).

2. The coaxial cable of claim 1, further comprising: A shield is disposed around the second flexible copper conductor.

3. The coaxial cable according to any one of claims 1 to 2, wherein: The first flexible copper conductor comprises a plurality of single copper wires that are not insulated from each other, or is formed by a plurality of single copper wires that are not insulated from each other, and / or wherein the second flexible copper conductor comprises a plurality of single copper wires that are not insulated from each other, or can be formed by a plurality of single copper wires that are not insulated from each other.

4. The coaxial cable according to any one of claims 1 to 3, wherein: The first flexible copper conductor comprises or consists of one or more copper braids and / or wherein the second flexible copper conductor comprises or consists of one or more copper braids.

5. The coaxial cable according to any one of claims 1 to 4, wherein: The insulator comprises or consists of a thermoplastic insulating plastic material.

6. The coaxial cable according to any one of claims 1 to 5, further comprising: At least one sensor, wherein at least the at least one sensor is a temperature sensor configured to detect a temperature of the coaxial cable.

7. The coaxial cable of claim 6, further comprising: At least one second sensor is configured to monitor a status of the cable and communicate the status to a user via an evaluation unit.

8. The coaxial cable according to claim 6 or 7, wherein: The temperature sensor is configured as a sensor wire introduced into a coaxial cable, for example, configured as a sensor wire braided into the coaxial cable.

9. The coaxial cable according to claim 1, wherein: The filler used in or for the non-conductive cable core comprises polypropylene (PP) or consists of polypropylene, and the non-conductive cable core has a thermal conductivity ranging between 0.17 and 0.22 W / (m*K).

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